Authentic Castore-designed Athletic Club Bilbao home jersey featuring the club’s iconic red-and-white vertical stripes. The V-neck collar is trimmed in black with 'CASTORE' branding repeated along the inner neck tape, emphasizing the technical sportswear heritage. Center chest displays the official Athletic Club Bilbao crest — a shield with red-and-white stripes, green tree, and Basque cross — above the main sponsor 'Kutxabank' in bold black lettering with white outline. Short sleeves feature black-and-white trim matching the collar, while the lower left hem includes a small 'AERT' performance tech tag and a black woven authenticity label. Made from lightweight, moisture-wicking synthetic fabric for optimal breathability and athletic performance. Ideal for match days, fan wear, or casual streetwear styling with its clean, classic football aesthetic. The jersey balances tradition (Bilbao’s historic striped identity) with modern technical construction, suitable for warm-weather training or everyday wear by supporters worldwide.